Diazotizable coloring-matter.



wILEELi/I BEneDoL'non LEVERKUSEN. NEAR concerns, GERMANY, ASSIGNOR TOFARBENFABRIKEN VOEM. isnrnnn. BAYER aco. on nnesnnnnn. GERMANY. A

CORPORATION OF GERMANY.

DIAZOTIZABLE GOLGRING-MATTER.

No Drawing.

To an whom, it may concern:

Be it known that I, WILHELM. Bnncnoms, doctor of hilosophy,che1nist,-citizen of the German *mpn-e, residing at Leve'rkusen,

near Cologne, Germany, have: invented new and useful Improvements inDiazotizable Coloring-Matter, of which the following is a specification.

' I have found that new and valuable diazotizable trisazodyestufi's canbe obtained by saponifying the. acylaminoazo compounds' obtained from-'1molecule ofa diazoti'zed 'monoacyl-meta -,phenyle n'ediamin and 1molecule of meta-phenyleneor 'ineta-tolnylenediamin sulfonic I acid,tetrazotizing the products thus obtained and combining them with 2molecules of meta phenyleneor meta-toluylenediamin. When dyed-on cottonthey can be diazotized on he in the usual. way and developed. w' hbeta-naph thol resulting in pure brown shades great fastness to washing.

The new dyes are after being dried and pulverized in the shape of theiralkaline salts dark powders soluble in water generally with a yellow tored coloration. Upon reduction with stannous chlorid and hydrochloricacid they are split up into nietaphenylenediamin: a trianinoloenzene-sulfonlc acid and a triamin of the benzene series.

In order "to illustrate the new process more full the followin r exam)le is iven the parts being by weight:--13. i parts ofmeta-annnoforznylanllid are diazotiaed 1n the presence oi 30parts ofhydecchloric acid (195 3%.) with parts of sodium nitrite, thetemperature being kept at about-.0 C. and coupled with 23 parts oftoluyle-nediamin sulfonate of soda (CH NH NH SO H 1 2 z 5 i dissolved insoda solution. After the formyl group) has been eliminated by boiling.the product with an acid or with a caustic alkali the product istetrazotized and coupled with 22 parts of lneta-phenylenediamin-'in sodaspecification of Letters Yatent.

Patented Feb. 1 1,1913.

Application filed June 19, 1912. Serial No. 704,569..

solution. The dyestufi is salted out with common salt pressed anddried.dark powder soluble in water with a yellow ish-red coloration, solublein concentrated sulfuric and with a brown coloration; yielding uponreduction with stannous chlorid and hydrochloric acid .meta-phenylenedtamin, triaminotoluene-sulfonic acid and triaminobenzene.' v

The formula of the dyestufi' is graphically' represented as follows:

Instead of meta-teluylenediamin-sulfonicacid meta phenylenediaminsulfonic acid and instead of meta-phenylenediamin metatoluylenediamincan be used.

l. The hereindescribed new diazotizable trisazo dyestuffs which areafter'being dried and pulverized in the shape of their alkaline Itisa'salts dark powders soluble in water generacid with a brown coloration;yielding uponrednction will; stannous chlorid and hydrochloric acidmeta-phenylenediamin, triamimy hand in the presence of two subscribingnotoluene-sulfomc 101d and trlammobenwltnesses. zene, W'hlCh dye can bedlazotlzed on the fiber and developed with beta-naphthol re- WILHELMBERGDOLT' 5 sulting in ure brown shades of great fnst- Witnesses:

ness to was ing,'substantia1ly as described. HELEN N UFER,

In testimony whereof I have hereunto set ALBERT NUFER.

